* dygraph translation

* cn doc bug fix

* translate dygraph according to 1.5.1 website + bug fix

* update 1.5.1 cn API

* add url

* update api_cn; fix the error of reverting layers_cn to 1.4; include previous changes

* update layers_cn; add code example to elementwise_mod

* delete recordio_writer_cn; revert index_cn

* update api_cn after review

* fix io_cn.rst

* update layers_cn

* update io_cn

* TRT预测库仅支持GPU编译

DLTP-739 完善tensorRT使用文档 TRT需要GPU编译

* DLTP-965 预测模型的保存和加载文档优化

* Windows_installation_English

* DLTP-1417 受训改为训练

* api modification

half modification of fluid/io/layers

* Apply suggestions from code review
Co-Authored-By: Nzy0531 <48094155+zy0531@users.noreply.github.com>

* Update fluid_cn.rst

* fix wrong apis in #767

* Textual proofreading

* 1.3 => develop (4.12)

* Delete InMemoryDataSet and QueueDataSet 

refer to #784

* add pixel shuffle and in_dygraph_mode

* api_trans_0410

* Update io_cn.rst

* Apply suggestions from code review

* fix bugs

* Fix arguments according to 1.3 en + ceil,floor trans +operator trans

* fix LoDTensorArray spell

* Update cn api to 1.3 fluid & layers

* Rest to 1.3

* cn api fix bugs

* Update fluid_cn.rst

* update cn_api

* add one change

* add example

* update layers_cn

* Update layers_cn.rst

* update layers

* Update layers_cn.rst

* Update layers_cn.rst

* Update layers cn 1218 (#3)

* update api_cn 1218

* Update metrics_cn.rst

* Update optimizer_cn.rst

* Update profiler_cn.rst

* update layers_nn

* Update layers_cn.rst

* Update layers_cn.rst

* update api_cn except layers

* update fluid_cn.rst

* Update metrics_cn.rst

* update_ciwhl

* update_2nd

* fix_3rd

* fix_deadlinks (#476)

* [infer][rl_note]develop=1.2 (#480)

* update_infer_toctree

* add_fluid

* Update release_note.rst

* delete en2zn link

* 1207

 1.english api reference links removed
2. formatted

* update transpiler

* update profilse_cn

 1.english api reference links removed
2. formatted

* add_api_cn (#437)

* add gpu benchmark page (#436)

* add gpu benchmark

* fix comments

* add chinese link in gen_doc.py (#439)

* modified gen_doc.py

* Update gen_doc.py

* update gen_doc.py

* Update mobile doc (#440)

* update_en_structure

* update_Paddle_commitid

* delete_DS

* update_mobile_doc

* Update book commit (#438)

* update_en_structure

* update_Paddle_commitid

* delete_DS

* update_book_commit_id

* update_api_rst

* Adjust structure of advanced usage (#442)

* adjust_structure_of_advanced_usage

* Update paddle_gpu_benchmark.md

* adjust_toctree_hidden

* fix_api_guide

* Update index.rst

* fix deadlinkes (#443)

* add_toctree (#445)

* adjust_beginners_structure (#446)

* adjust_beginners_structure

* Update index.rst

* update install_doc for python3 (#418)

* update install_doc for python3

* update python3.5+ info,test=develop

* fix review, test=develop

* fix_pic (#447)